Disable rules for asan and ubsan prebuilts from aosp/master

Bug: http://b/31320715

Temporarily disable rules for asan and ubsan prebuilts from aosp/master.
These get exported as prebuilts from
platform/prebuilts/clang/host/linux-x86/Android.mk.  This can be
reverted once soong has support to pick a module from prebuilts or build
it from scratch based on a build option.

Test: Build AOSP and run RenderScript tests (host tests for slang and
libbcc, RsTest, CTS)

Change-Id: I71d0951e4f44f145cc126b01630dc577574b1c4d
2 files changed